CN106796352A - Head-up display - Google Patents

Abstract

An object of the present invention is to efficiently direct image light toward a viewer. The display (14) emits projection light (100) representing an image, the transmissive screen (17) forms an image of the projection light (100) and diffuses it as image light (200), and the projection lens (15) transforms the projection light (100) Zoom in to make it image on the transmissive screen (17), the light distribution adjustment mechanism (16) is arranged between the transmissive screen (17) and the projection lens (15), by refracting the projected light (100), thus, The light distribution of the image light (200) emitted from the transmissive screen (17) is adjusted for each area.

Description

HUD

technical field

The invention relates to a head-up display device for superimposing a virtual image on a real scene for recognition.

Background technique

As a conventional head-up display (HUD: Head Up Display), the type described in Patent Document 1 is included. Such a HUD, as shown in FIGS. 7 and 8 , includes: a projector 501 that emits projection lights L1, L2, and L3; a projection lens 502 that forms images of the projection lights L1, L2, and L3. On the transmissive screen 503; the transmissive screen 503, the transmissive screen 503 receives the projection light L1, L2, L3 from the projection lens 502 through the back, forms a real image, diffuses on its outer side, and emits image light representing a real image Plane mirror 504, concave mirror 505, the plane mirror 504, concave mirror 505 make the image light M1, M2, M3 diffused by the transmissive screen 503 toward the windshield (projection reflection surface) 510 of the vehicle. P1 , P2 , and P3 shown in FIGS. 7 and 8 represent optical paths of image light that help the observer recognize virtual images.

Projection light L directed toward the transmissive screen 503 from the projection lens 502 expands in a tapered shape toward the transmissive screen 503 . The projection light L1 incident on the transmissive screen 503 is diffused by the transmissive screen 503 , and is diffused as image light M1 with the same light distribution axis M1a as the projection light L1 as the optical axis. In addition, the projection lights L2 and L3 incident on the transmissive screen 503 are diffused by the transmissive screen 503 in the same way, with the same light distribution axes M2a and M3a as the direction of the projected lights L2 and L3 as the optical axes, as image light. M2, M3 and spread.

Existing technical literature

patent documents

Patent Document 1: JP Unexamined Publication No. 2004-126226

Contents of the invention

The problem to be solved by the invention

However, as in Patent Document 1, when the projection light L from the projection lens 502 is projected onto the transmissive screen 503 as it is, the orientations of the light distribution axes M1a, M2a, and M3a emitted from the transmissive screen 503 are different from those of the projected light. L1, L2, and L3 are basically the same. As a result, the optical paths of the image lights M1 and M3 emitted from the predetermined area of the transmissive screen 503 do not follow the optical paths P1 and P3 toward the viewpoint 520 of the observer (the optical distribution axes M1a and M3a do not coincide with the optical paths P1 and P3). Accordingly, since the image light M reaching the viewpoint 520 of the observer is weak, the brightness of the virtual image recognized by the observer may decrease. In addition, since the light distribution axes M1a, M3a of the image light M1, M3 of the optical path diffused through each area of the transmissive screen 503 do not follow the optical path P1, P3 toward the viewer's viewpoint 520, the light of the image light M1, M3 Utilization efficiency is reduced.

Therefore, the present invention has been made in view of the above-mentioned actual situation, and an object of the present invention is to provide a head-up display device capable of efficiently directing image light toward a viewer.

Technical solutions for solving problems

In order to achieve the first object above, the head-up display device of the present invention includes: a projector that emits projection light representing an image; a screen that forms an image of the projection light and diffuses it as image light; an imaging optical system , the imaging optical system amplifies the projected light and images it on the above screen; the light distribution adjustment mechanism, the light distribution adjustment mechanism is arranged between the above screen and the above-mentioned imaging optical system, by refracting the above-mentioned projected light, for each The light distribution of the above-mentioned image light emitted from the above-mentioned screen is adjusted in each area.

In addition, in the head-up display device according to the second invention, the light distribution adjustment mechanism adjusts the image light emitted from each area of the screen to the optical axis side of the projection light.

Furthermore, in the head-up display device according to the third invention, the first direction extending in a direction perpendicular to the optical axis of the projection light extends in a direction perpendicular to the optical axis of the projection light and is parallel to the first direction. In the second direction perpendicular to the first direction, the light distribution adjusting mechanism increases the adjustment amount of the projection light at least in the first direction along with the distance from the optical axis of the projection light.

The effect of the invention

According to the present invention, image light can be directed toward the observer with good efficiency.

Description of drawings

FIG. 1 is a schematic structural view of a head-up display device according to a first embodiment of the present invention;

Fig. 2 is a diagram for the above-mentioned embodiment, Fig. 2(a) is a schematic structural view of the light distribution adjustment mechanism viewed from the second direction, and Fig. 2(b) is a structural schematic view of the light distribution adjustment mechanism viewed from the first direction;

Fig. 3 is a diagram for the second embodiment, Fig. 3(a) is a structural schematic view of the light distribution adjustment mechanism viewed from the second direction, and Fig. 3(b) is a structural schematic view of the light distribution adjustment mechanism viewed from the first direction ;

4 is a schematic structural view of a head-up display device according to a third embodiment of the present invention;

Fig. 5 is a diagram for the third embodiment of the present invention, Fig. 5(a) is a structural schematic diagram when viewing the light distribution adjustment mechanism from the second direction, and Fig. 5(b) is a view when viewing the light distribution adjustment mechanism from the first direction Schematic diagram of the structure;

Fig. 6 is a structural schematic view of the modified example when viewing the light distribution adjustment mechanism from the second direction;

FIG. 7 is a structural schematic diagram of a head-up display device in the prior art;

FIG. 8 is a schematic structural view of the light distribution adjustment mechanism viewed from the second direction for a modified example.

detailed description

(first embodiment)

Next, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing the configuration of a head-up display device (hereinafter referred to as an HUD device) 1 according to the present embodiment. The HUD device 1 of the present embodiment is installed inside a dashboard of a vehicle. The HUD device 1 emits the image light 200 to the windshield 2 of the vehicle. The image light 200 reflected by the windshield 2 is directed toward the visible range 3 . When the user's point of view position is within the visible range 3 , the user sees a virtual image of a desired brightness generated by the image light 200 . The user recognizes through the windshield 2 so that the real scene in front of the vehicle is superimposed and the virtual image is located in the distance.

As shown in FIG. 1, the HUD device 1 includes: a display device 10 that emits image light 200 that displays a virtual image S1 and represents the real image S1; a first reflector 20 that reflects the display device. 10 the emitted image light 200; the second reflector 30, the second reflector 30 amplifies the image light 200 reflected by the first reflector 20, and directs it toward the windshield window 2; the housing 40, the housing 40 receives the above-mentioned These parts; a control unit, which is not shown in the figure, and performs electrical control of the HUD device 1 .

(display device 10)

As shown in FIG. 1, the display device 10 includes: a light source 1 that emits illuminating light not shown in the figure; a light source reflector 12; a prism 13; a reflective display 14; a projection lens 15; The mechanism 16 ; the transmissive screen 17 forms the real image S1 on the transmissive screen 17 , and emits the image light 200 representing the real image S1 toward the first reflector 20 .

The light source 11 includes a plurality of LEDs capable of emitting red, blue, and green lights, respectively, and emits the above-mentioned illumination light according to a desired color, light intensity, and timing under control from a control unit. In addition, the display device 10 of this embodiment adopts a field sequential color (Field Sequential Color) drive method, and the light sources 11 of each color emit the above-mentioned illumination light in a time-division manner.

The light source mirror 12 is a dichroic mirror or the like. The dichroic mirror reflects light of a specified wavelength, transmits light of other wavelengths, and aligns the traveling lines of the red, blue, and green lights emitted from the plurality of light sources 11. The illumination light from the light source 11 is made to enter the prism 13 at an appropriate angle toward the prism 13 .

The prism 13 is provided between the light source reflector 12 and the reflective display 14 , and has an inclined surface inclined at a predetermined angle with respect to the optical axis of the illumination light incident from the light source reflector 12 . The above-mentioned illumination light from the light source reflector 12 incident on the inclined surface passes through the inclined surface and enters the reflective display 14. Then, the projection light 100 emitted from the reflective display 14 enters the prism 13 again and passes through the inclined surface. The projection light 100 is reflected in the direction of the projection lens 15 and emitted from the projection surface 13a.

Reflective display 14 is such as DMD (Digital Micromirror Device, Digital Micromirror Device), LCOS (registered trademark: silicon-based liquid crystal, Liquid Crystal On Silicon) etc. reflective displays, it according to the control of the above-mentioned control section, will from the prism The above-mentioned illumination light incident on the prism 13 is converted into projection light 100 for displaying a virtual image, and is reflected toward the prism 13 .

The projection lens 15 is formed by, for example, a convex lens having a spherical surface, and enlarges the projection light 100 entered from the prism 13 , and emits it toward the light distribution adjustment mechanism 16 . The projection lens 15 is an imaging optical system that receives the projection light 100 from the reflective display 14 and forms the real image S1 on the later-described transmissive screen 17 .

The light distribution adjustment mechanism 16 is a lens as shown in FIG. The first direction X extending has a different curvature from the second direction perpendicular to the first direction X, and the light distribution adjustment mechanism 16 is provided on the optical path of the projection light 100 from the projection lens 15 to the transmissive screen 17 . The light distribution adjustment mechanism 16 adjusts the light distribution of the image light 200 emitted from each area of the transmissive screen 17 by refracting the projection light 100 from the projection surface 13 a toward the transmissive screen 17 . The specific function of the light distribution adjustment mechanism 16 will be described later.

The transmissive screen 17 is a diffusion film made of resin such as polycarbonate, forms an image of the projection light 100 emitted from the projection lens 15 as a real image S1, and emits image light 200 diffused with a constant distribution. In addition, the light distribution of the image light 200 emitted from the transmissive screen 17 is adjusted for each area of the transmissive screen 17 by the action of the light distribution adjustment mechanism 16 .

In the display device 10 described above, the reflective display 14 generates the projected light 100 and emits the projected light 100 from the projection surface 13a, and the projection lens 15 forms an image of the projected light 100 as a real image S1 on the transmissive screen 17. Next, the light distribution adjustment mechanism 16 adjusts the light distribution of the image light 200 emitted from each area of the transmissive screen 17 by refracting the projection light 100 from the projection lens 15 toward the transmissive screen 17, thereby efficiently, Direct the image light 200 in the direction of the visible range 3 .

The first reflector 20 is a flat mirror, and a reflective film is formed on the surface of a substrate made of, for example, a synthetic resin material or a glass material by vapor deposition or the like. The first reflector 20 reflects the image light 200 diffused and transmitted by the transmissive screen 17 toward the second reflector 30 described later.

The second reflector 30 is a concave mirror, and a reflective film is formed by vapor deposition or the like on the surface of a substrate made of, for example, a synthetic resin material. In the second reflector 30, the reflective surface has a concave free-form surface. The positional relationship of the windshield 2; the curvature of the windshield window 2; the imaging distance of the required virtual image; the angle of view of the HUD device 1 recognized by the user and so on. The second reflector 30 can be designed so that the distortion of the above-mentioned virtual image is minimized, and also amplifies the image light 200 reflected by the first reflector 20 and reflects it toward the windshield 2 .

In addition, the second reflector 30 has an actuator 30 a capable of adjusting the angle of the second reflector 30 . The actuator 30a can rotate the second reflector 30 in accordance with the viewpoint position of the observer detected by a viewpoint position detection mechanism constituted by a camera not shown in the figure, and can direct the image light 200 toward the visible direction. Range 3. In addition, the actuator 30a can also rotate the second reflection part 30 in response to the operation of an operation part not shown in the figure.

The above is the configuration of the HUD device 1 of the present embodiment. Thus, the operation of the light distribution adjustment mechanism 16 will be described using FIG. 2 . Fig. 2(a) is a schematic structural view of the light distribution adjustment mechanism 16 viewed from the second direction Y, and Fig. 2(b) is a structural schematic view of the light distribution adjustment mechanism 16 viewed from the first direction X.

(The role of the light distribution adjustment mechanism 16)

First, the operation of the light distribution adjustment mechanism 16 when the light distribution adjustment mechanism 16 is viewed from the second direction Y will be described with reference to FIG. 2( a ). In addition, the projection light 100 (projection light 101, projection light 102, and projection light 103) emitted from the projection surface 13a shown in FIG. The lower end of the above-mentioned virtual image is formed, the projection light 102 forms near the upper and lower middle of the above-mentioned virtual image, and the projection light 103 forms the upper end of the above-mentioned virtual image.

The projection light 100 (projection light 101 , projection light 102 , and projection light 103 ) emitted from each area of the projection surface 13 a enters the light distribution adjustment mechanism 16 via the projection lens 15 . The light distribution adjustment mechanism 16 makes the light distribution axis 201a, light distribution axis 202a, and light distribution axis 203a of the image light 201, image light 202, and image light 203 emitted by the transmissive screen 17 roughly along the optical path P1 toward the visible range 3 The projection light 101 , the projection light 102 , and the projection light 103 incident on the transmissive screen 17 are refracted in the manner of the optical path P2 and the optical path P3 .

In the first direction X, the light distribution adjustment mechanism 16 largely refracts the projection light 100 (projection light 101, projection light 103) incident to a position away from the optical axis of the light distribution adjustment mechanism 16, and emits it. To the transmissive screen 17 side. Specifically, the light distribution adjustment mechanism 16 inclines the projection light 101 at an angle θ1 to emit to the optical axis side of the light distribution adjustment mechanism 16, and inclines the projection light 103 at an angle θ3 to emit to the optical axis side of the light distribution adjustment mechanism 16. . In addition, the projection light 102 along the optical axis of the light distribution adjustment mechanism 16 is not refracted by the light distribution adjustment mechanism 16 (the light distribution is not adjusted by the light distribution adjustment mechanism 16), but is imaged on the transmissive screen 17 as image light. 202 shot. The light distribution adjustment mechanism 16 increases the adjustment amount (inclination angle) of the projection light 100 as the optical axis of the light distribution adjustment mechanism 16 moves away from the light distribution adjustment mechanism 16 .

Next, the action of the light distribution adjustment mechanism 16 when the light distribution adjustment mechanism 16 is viewed from the first direction X will be described with reference to FIG. 2( b ). In addition, the projection light 100 (projection light 104, projection light 105, and projection light 106) emitted from the projection surface 13a shown in FIG. At the right end of the virtual image, the projected light 105 forms the vicinity of the left and right center of the virtual image, and the projected light 106 forms the left end of the virtual image.

The projection light 100 (projection light 104 , projection light 105 , and projection light 106 ) emitted from each area of the projection surface 13 a enters the light distribution adjustment mechanism 16 via the projection lens 15 . The light distribution adjustment mechanism 16 makes the light distribution axis 204a, light distribution axis 205a, and light distribution axis 206a of the image light 204, image light 205, and image light 206 emitted from the transmissive screen 17 roughly along the optical path P4 toward the visible range 3 The projection light 104 , the projection light 105 , and the projection light 106 incident on the transmissive screen 17 are refracted in the manner of the optical path P5 and the optical path P6 .

In the second direction Y, the light distribution adjustment mechanism 16 largely refracts the projection light 100 (projection light 104, projection light 106) incident at a position away from the light distribution adjustment mechanism 16, and emits it to the transmissive screen. 17 sides. Specifically, the light distribution adjustment mechanism 16 inclines the projection light 104 at an angle θ4 to emit to the optical axis side of the light distribution adjustment mechanism 16, and inclines the projection light 106 at an angle θ6 to emit to the optical axis side of the light distribution adjustment mechanism 16. . In addition, the projection light 105 along the optical axis of the light distribution adjustment mechanism 16 is not refracted by the light distribution adjustment mechanism 16 (the light distribution is not adjusted by the light distribution adjustment mechanism 16), but is imaged on the transmissive screen 17 as image light. 205 shots. The light distribution adjustment mechanism 16 increases the adjustment amount (inclination angle) of the projection light 100 as the optical axis of the light distribution adjustment mechanism 16 moves away from the light distribution adjustment mechanism 16 . In addition, the angles θ1 and θ3 (adjustment amount) at which the image light 201 and image light 203 are refracted in the vertical direction of the visible range 3 by the light distribution adjustment mechanism 16 are larger than the angles θ1 and θ3 (adjustment amount) that make the light distribution in the left and right directions of the visible range 3 larger. The image light 204 and image light 206 are refracted at angles θ4 and θ6 (adjustment amount).

As described above, according to the HUD device 1 of this embodiment, since the light distribution of the image light 200 emitted from each area of the transmissive screen 17 can be adjusted by the light distribution adjustment mechanism 16, the image light can be efficiently distributed. 200 toward view range 3.

(second embodiment)

Next, the action of the light distribution adjustment mechanism 16a of the second embodiment will be described with reference to FIG. 3 . Fig. 3(a) is a schematic structural view of the light distribution adjustment mechanism 16a viewed from the second direction Y, and Fig. 3(b) is a structural schematic view of the light distribution adjustment mechanism 16a viewed from the first direction X. In addition, in FIG. 3 , the same reference numerals are assigned to the same configurations as those of the above-mentioned first embodiment, and description thereof will be omitted.

The HUD device 1 of the second embodiment is different in that it has a light distribution adjustment mechanism 16a whose characteristics are different from those of the light distribution adjustment mechanism 16 of the above-mentioned first embodiment. The light distribution adjustment mechanism 16a of the second embodiment is composed of a lenticular lens capable of refracting the projection light 100 in the first direction X and not capable of refracting the projection light 100 in the second direction Y.

The operation of the light distribution adjustment mechanism 16a in the second embodiment when the light distribution adjustment mechanism 16a is viewed from the first direction X will be described with reference to FIG. 3(b).

The projection light 100 (projection light 104 , projection light 105 , and projection light 106 ) emitted from each area of the projection surface 13 a enters the light distribution adjustment mechanism 16 a through the projection lens 15 . The light distribution adjustment mechanism 16 a emits the projection light 104 , the projection light 105 , and the projection light 106 to the transmissive screen 17 side without changing the directions of the projection light 104 , 105 , and 106 . The transmissive screen 17 emits image light 204 having substantially the same light distribution axis 204a, light distribution axis 205a, and light distribution axis 206a as the projection light 104, projection light 105, and projection light 106 incident from the back. , image light 206 . In addition, the projection light 104 from the projection lens 15, the projection light 105, The projection angle of the projection light 106 .

Also in such a configuration, since the light distribution of the image light 200 emitted from each area of the transmissive screen 17 can be adjusted by the light distribution adjustment mechanism 16a, the image light 200 can be directed toward the visible range 3 efficiently. In addition, since the light distribution adjustment mechanism 16a has the ability to refract the projection light 100 only in one axial direction (the first direction X), the optical design of the light distribution adjustment mechanism 16a can be easily performed.

(third embodiment)

The HUD device 1 of the third embodiment is different in that the image light 201 , the image light 202 , and the image light 203 emitted from each area of the transmissive screen 17 intersect to form an intermediate image S2 at a predetermined position. Next, a third embodiment of the present invention will be described with reference to FIGS. 4 and 5 . 4 is a schematic structural view of the HUD device 1 of the third embodiment. FIG. Schematic diagram of the structure of the light adjustment mechanism 16b.

The light distribution adjustment mechanism 16b of the third embodiment is, for example, a lenticular lens, which receives the projection light 100 and emits the projection light 100 refracted toward the transmissive screen 17 in an optical area larger than that of the transmissive screen 17 to image the real image S1. region is formed.

(Function of Light Distribution Adjustment Mechanism 16b)

First, the action of the light distribution adjustment mechanism 16 b when the light distribution adjustment mechanism 16 b is viewed from the second direction Y will be described with reference to FIG. 5( a ).

The projection light 100 (projection light 101 , projection light 102 , and projection light 103 ) emitted from each area of the projection surface 13 a enters the light distribution adjustment mechanism 16 b via the projection lens 15 . The light distribution adjustment mechanism 16b refracts the projection light 101, the projection light 102, and the projection light 103 and emits them to the transmissive screen 17 in the following manner: the image light 201 emitted from the transmissive screen 17, the image light 202 , the light distribution axis 201 a , the light distribution axis 202 a , and the light distribution axis 203 a of the image light 203 are basically along the optical path P1 , the optical path P2 , and the optical path P3 toward the visible range 3 .

The projected light 100 (projected light 101, projected light 103) incident at a position away from the optical axis of the light distribution adjusting mechanism 16b is greatly refracted in the first direction X, and is emitted to the transmissive screen 17 side. Specifically, the light distribution adjustment mechanism 16 b obliquely emits the projection light 101 and the projection light 103 toward the optical axis side of the light distribution adjustment mechanism 16 b. In this way, the entirety of the image light 200 is directed toward the first reflection unit 20 while converging, so that the image light 200 can be received by the small first reflection unit 20 . The light distribution adjustment mechanism 16b increases the adjustment amount (inclination angle) of the projection light 100 as the optical axis of the light distribution adjustment mechanism 16b moves away from the light distribution adjustment mechanism 16b.

In addition, in the HUD device 1 according to the third embodiment, since the image light 200 emitted from the transmissive screen 17 is formed into an image on the intermediate image S2, the first reflecting portion 20b is constituted by a concave mirror. The first reflection unit 20 forms the image light 200 of the real image S1 formed by passing through the transmissive screen 17 as an intermediate image S2 between the first reflection unit 20 and the second reflection unit 30 . The intermediate image S2 is formed on the side of the second reflector 30 relative to the focal length of the second reflector 30 , and is located near the focal distance of the second reflector 30 , thereby allowing the observer to recognize a high-magnification virtual image.

As described above, in the HUD device 1 of the third embodiment, the light distribution axis 200a of the image light 200 emitted from each area of the transmissive screen 17 is directed toward the direction of the light distribution adjustment mechanism 16b by the light distribution adjustment mechanism 16b. On the optical axis side, the intermediate image S2 can be efficiently generated by the small first reflection unit 20 .

The present invention is not limited to the above embodiments and drawings. Modifications (also including deletion of structural elements) can be appropriately made within a range that does not change the essence of the present invention. An example of a modified example is given below.

In the above-described embodiment, the light distribution adjustment mechanism 16 that refracts the projection light 100 from the projection lens 15 is a free-form surface lens or a lenticular lens, but it is not limited thereto, and may be a spherical or aspherical rotationally symmetric lens as appropriate. Toroidal mirrors.

In addition, in the above-mentioned embodiment, the light distribution adjustment mechanism 16 is constituted by a lens, but the light distribution adjustment mechanism 16 may be constituted by a reflecting mirror having a concave surface.

Furthermore, in the above-described embodiment, the transmissive screen 17 is a diffusion film, but the transmissive screen 17 may also be constituted by a microlens array. Since the transmissive screen 17 is constituted by a microlens array, the size and the light distribution direction of the image light 200 emitted from each area of the transmissive screen 17 can be adjusted for each area of the transmissive screen 17. It is possible to direct the image light toward the viewer with better efficiency.

In addition, in the above-mentioned embodiment, the transmissive screen 17 is arranged perpendicular to the optical axis of the light distribution adjustment mechanism 16, but as shown in FIG. 6, in the first direction X and/or the second direction Y, The transmissive screen 17 is inclined with respect to the optical axis of the light distribution adjustment mechanism 16 . This configuration prevents sunlight entering from the outside of the HUD device 1 from passing through the transmissive screen 17 and reaching the light source reflector 12 and the light source 11 .

In addition, the reflection-transmission surface on which the image light 200 is projected is not limited to the windshield 2 of the vehicle. The reflective and transmissive surface on which the image light 200 is projected can also be, for example, a specially provided combiner component.

In the above description, in order to facilitate the understanding of the present invention, descriptions of unimportant known technical matters are appropriately omitted.

Industrial Utilization Possibilities

The present invention relates to a head-up display device that superimposes a virtual image on a real scene for recognition, and is preferably a display device that is installed, for example, in a dashboard of a vehicle and emits image light to the windshield of the vehicle.

Explanation of labels:

Reference numeral 1 represents a HUD device (head-up display device);

Label 2 represents windshield front window (reflection transmissive surface);

Label 3 represents the visible range;

Reference numeral 10 represents a display device;

Reference numeral 11 represents a light source;

Label 12 represents light source reflector;

Reference numeral 13 represents a prism;

Reference numeral 14 denotes a reflective display (projector);

Reference numeral 15 denotes a projection lens (imaging optical system);

Label 16 represents light distribution adjustment mechanism;

Reference numeral 17 denotes a transmission type screen (screen);

Reference numeral 20 represents the first reflection part;

Reference numeral 23 represents the second reflection part;

Label 40 represents shell;

Reference numeral 100 represents projection light;

Reference numeral 200 denotes image light.

Claims (3)

1. a kind of head-up display, it is characterised in that the head-up display includes：

Projector, the projector projects the projected light for representing image；

Screen, the screen is imaged to the projected light, is spread as image light；

Imaging optical system, the imaging optical system is imaged on above-mentioned screen above-mentioned projection light amplification；

Luminous intensity distribution adjustment mechanism, the luminous intensity distribution adjustment mechanism is arranged between above-mentioned screen and above-mentioned imaging optical system, on making Projection anaclasis is stated, for the luminous intensity distribution of above-mentioned image light of each region adjustment emitted by above-mentioned screen.

2. head-up display according to claim 1, it is characterised in that above-mentioned luminous intensity distribution adjustment mechanism will be from above-mentioned screen Each region emitted by above-mentioned image light be adjusted to the optical axis side of above-mentioned projected light.

3. head-up display according to claim 1 and 2, it is characterised in that in the optical axis phase of edge and above-mentioned projected light Vertical direction and extend the 1st direction, extend along the direction perpendicular with the optical axis of above-mentioned projected light and with the above-mentioned 1st In the 2nd mutually orthogonal direction of direction, above-mentioned luminous intensity distribution adjustment mechanism is at least in above-mentioned 1st direction, the adjoint light with above-mentioned projected light Axle leaves, and to make the adjustment amount of above-mentioned projected light increase.